<html><head>
<style>
#colset { width: 200px;
          -moz-column-count: 3;
          -moz-column-gap: 4px;
          padding: 4px;
	  outline: 1px orange solid; }
#b      { height: 12px;         
          outline: 1px green dotted;}
#c      { height: 13px;
          background: yellow;}
</style></head><body><div id="colset"><div id="b"><div id="c"></div></div></div>
</body></html>